Process for producing carboxypolysaccharide

Details Process for producing carboxypolysaccharide Process for producing carboxypolysaccharide

1999-06-04

2000-08-29

Wilson, James O.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

C08B 3702

Patent

active

061110973

ABSTRACT:
In a process of producing a carboxypolysaccharide by oxidizing a polysaccharide in the presence of a ruthenium compound and an oxidizing agent, the expensive ruthenium is easily and efficiently recovered. Ruthenium dissolved in a reaction mixture after the oxidation of the polysaccharide is converted, after or without being subjected to a heat. treatment, to high oxidation sate, which is then recovered by the extraction with a water-insoluble organic solvent. The recovered ruthenium is reduced to low oxidation state and reused in a subsequent production of the carboxypolysaccharide.

REFERENCES:
patent: 5424419 (1995-06-01), Hasegawa et al.
patent: 5766572 (1998-06-01), Hasegawa et al.
patent: 5906997 (1999-05-01), Schartz et al.
Shigemasa et al., Polymer J., vol. 23, No. 10, pp. 1279-1281 (1991).
F.S. Martin, J. Chem. Soc., pp. 2564-71, (1954).

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